Screw-blank-heading machine



2 Sheets-+Sheet 1.

(No Model.)

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SGREW BLANK HEADINGMAGHINE.

Patented July 28, 1885;

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2 SheetsSheet 2'.

M. STANNARD.

SCREW BLANK HEADING MACHINE.

(No Moclel Patented July 28, 1885.

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MONROE STANNARD, OF HARTFORD, CONNECTICUT.

SCREW- BLANK-HEADING MACHINE.

5P'BCIFICATION forming part of Letters Patent No. 323,373, dated July 28, 1885.

Application filed October (3, 1884. (No model.)

T 0 all whom it may concern:

Be it known that I, Monnon STANNARD, a citizen of the United States, residing in the city and county of Hartford, State of Connecticut, have invented a new and useful Improvement in Screw-Blank-l-leadin g Machines, of which the following is a specification, reference being had to the accompanying draw= ings, in which- Figure 1 is a plan view of a screw-blankheading machine having my improvements attached thereto. Fig. 2 is an elevation of the front side of the same, this being the side on which the said improvements are located. Fig. 3 is a vertical transverse section in line X X, Figs. 1 and 5. Fig. l is an enlarged plan view with the top of box B broken away, showing the parts of my improvement in one position. 5 is a similar view show ing the same in another position.

Similar letters refer to similar parts throughout the several views.

My invention relates to that part of the machine the function of which is to so operate the dies that they shall cut off a screwblank, then firmly clamp the same while it is being headed, and, finally, to release the headed blank and stand ready to receive the end of the wire from which to out off another blank. The object is to furnish a device intermediate to those dies and the drivingshaft of the machine which shall be at once simple, compact, and powerful and operate with but a small amount of friction. This object I have accomplished by means of certain combinations of mechanism, which I will first describe in connection with the drawings and afterward specifically point out in the claim.

In the drawings, A is the frame of a heading-machine of the class nsin g opening dies supported on legs A. S is the crankshaft running in bushings 13 which are inserted into the sides of the frame, provided with a crank, G which imparts a reciprocating motion to the punch-carrying slide H by means of a connectingrod, U, and pin 1?, and with a cam, K, for working the die-operating devices. Slide H is held down by straps H, secured to the frame by bolts and is furnished with a punch-holder, l), for carrying the headingpunch D. The dies T are constructed to'slide laterally closely but frcelyin a groove formed I in the inner side of the die-holder A which holder is secured into the machine in the usual manner. The wire W is fed to the machine by a device, (not shown,) as in Fig. 1, while the dies are loosely held in their forward position by means of spring Q, rod T and block T, and the blank is then cut therefrom by a forcible backward movement imparted to sail dies by slide T which movement drives them back until the block T rests on the adjusting-screw B thereby firmly holding them in their closed position while the punch heads the blank. The parts thus far enumerated form no part of my invention, being old, but have been described in order that the co-operation of my improvements with them may be more readily understood, it being the function of said improvement to communicate the aforesaid movement to slide T B, is rigidly secured by bolts U. The open ends of this box are preferably closed by blocks 13 and 13 between which the slide L is reciprocated by means of some suitable device between it and cam K. That device, as shown in the drawings, consists of a longitudinallyadjustable connecting-rod, 0, pin P pin P arm A supported on stud P pin P and roller R, and spring Q The slide L and slide T each has formed in it a socket suit able to receive one end of a link, T. A series of friction-rollers,1t-, carried on pins I in bars R are placed between slide L and the outer side of box B to receive the pressure which is communicated from the dies through slide T and link T to said slide L. That pressure is chiefly caused by the upsetting of the blank between dies T during the operation of heading it; and, as this upsetting takes place throughout the whole length of the blank, that pressure is often very great. By so constructing the parts that the angle V, Fig. 4, is slightly, and only slightly, greater than the angle of repose the slide L is easily held by cam K in the position shown in this figure while receiving the pressure from the dies; and when at the proper movement the high part of cam K. passes roll R that pressure serves to move said slide toward its position in Fig. 5, which motion is then completed by spring Q thereby allowing the dies to be thrown by spring Q} into position to recevc To the front side of the frame a strong box,

wire for another blank. This operation of the parts is made easy by the rollers R taking the pressure aforesaid, these rollers being, whenof good material and well made, in themselves almost entirely frictionless. In'practice, owing to their slight friction and consequent easy Workin g, the whole device runs at a high speed without becoming injuriously heated, as frequently happens with the old devices for the same purpose. The blocks B are convenient for keeping the set of rollers R in proper position in front of slide L,

and blocks B for preventing link T from drawing that slide laterally toward the frame should spring Q fail to properly perform its office.

Having thus described my invention, I claim- MONROE STANNARD.

itnesses F. H. RICHARDS, G. O. PALMER. 

